i've never heard of a fake candle spell, but i suppose there could be some in theory. just take a candle of the corresponding colour to your question. if you have oil to anoint it, do so, then hold it [or cup your hands around it] and charge it with energy. light the candle and visualize your intent as it burns down. just be sure not to blow out the candle. [if you must put it out, snuff the flame] that's about it really. if you cast by the moon and/or the days of the week and/or the hour, check out the best time, but basically that's it.
in regards to the real versus fake candle spell, as mentioned, use common sense. spells cannot do physical changes, so a spell that tells you to visualize yourself becoming a cat [for example] won't work, while a spell that says to visualize yourself finding money would. of course you have to put in some effort as well, don't cast a candle spell for a job, then sit and watch tv or something, fill out some applications.